I'll add my voice to this. With an i7-9700K and GTX 1080TI, at 1080p, nothing this game throws at me should be dipping the framerate below a rock solid 60fps, but lower islands very definitely do. I suggest making it possible to disable lower islands with a menu switch, but not disabling them outright of course since it's still a brilliant feature.

@Fred Asparagus: I'm very surprised you are seeing fps drops below 60 with those specs. I myself have a similar rig, but with a weaker 8700 processor, running at a higher 1440p resolution, and haven't noticed any framerate issues. Granted, I haven't been looking for them either. I will pay closer attention next time!